The files contained in the dataset are the eye-tracking and behavioral data collected for the study titled “Differences in looking at own- and other-race faces are subtle and analysis-dependent: An account of discrepant reports” published in PLoS One.

This ReadMe has the following sections to help you understand the data contained within the data files:
(1) Preliminary notes about the data files
(2) Descriptions of the data columns in ORE_FixReport.xls
(3) Descriptions of the data columns in ORE_AOIReport.xls
(4) Numerical coding for conditions in ORE_FixReport.txt and ORE_AOIReport.txt
(5) Data columns and data coding in the ORSubjectNum#.txt files







(1) >>>>—————— Preliminary notes about the data files ——————<<<<

Subject number labels are consistent across all data files.  However the numerical codes for conditions in the “ORSubjectNum#.txt” files are not equivalent to those in ORE_FixReport.txt and ORE_AOIReport.txt, so check the notes in this readMe to determine the condition codes for each file.

Subject 3 only has 106 trials saved in the eye-movement data (instead of the full 144 trials) due to a supposed technical glitch.  The full 144 trials are contained in the behavioral data file (ORSubjectNum3.txt) though.

The AOI analyses in our published study were computed from the first five fixations only, thus AOI analysis was done with data from the ORE_FixReport.xls file, not the ORE_AOIReport.txt, which takes the entire trial into account.







(2) >>>>—————— Descriptions of the data columns in ORE_FixReport.xls ——————<<<<

ORE_FixReport.xls is the output of a “Fixation Report” produced through the EyeLink Data Viewer.  Following are the variables  contained in this output along with descriptions of these variables:

SUBJECTNUM - Subject number Label
TRIAL - trial number in the trial sequence
RACE - race of stimulus face
GENDER - gender of stimulus face
CURRENT_FIX_INDEX - Ordinal sequence of the current fixation in the trial
CURRENT_FIX_DURATION - Duration of the current fixation
CURRENT_FIX_INTEREST_AREA_DWELL_TIME - Total amount of fixation dwell time (in msec) on the interest area to which the current fixation belongs.
CURRENT_FIX_INTEREST_AREA_INDEX - The index of the interest area in which the current fixation falls. (1 = left eye, 2 = bridge of nose, 3 = right eye, 4 = left half-nose, 5 = left half-mouth, 6 = right half-nose, 7 = right half-mouth)
CURRENT_FIX_NEAREST_INTEREST_AREA - Nearest interest area the current fixation is assigned to
CURRENT_FIX_NEAREST_INTEREST_AREA_DISTANCE - Distance between the current fixation point and the center of the nearest interest area the current fixation is associated with
FIX - pre-stimulus fixation dot location (relative to upcoming stimulus)
FLIP - whether the original stimulus image was left-right flipped at presentation
CURRENT_FIX_X - X coordinate of the current fixation
CURRENT_FIX_Y - Y coordinate of the current fixation
CURRENT_FIX_START - Trial time when the current fixation starts
TRIAL_START_TIME - The start time (in milliseconds since EyeLink tracker was activated) of the trial
IP_START_TIME - Start time (in milliseconds since EyeLink tracker was activated) of the interest period







(3) >>>>—————— Descriptions of the data columns in ORE_AOIReport.xls ——————<<<<

ORE_AOIReport.xls is the output of a “Interest Area Report” produced through the EyeLink Data Viewer.  Following are the variables  contained in this output along with descriptions of these variables:

SUBJECTNUM - Subject number Label
TRIAL - trial number in the trial sequence
IA_ID Ordinal ID of the current interest area (1 = left eye, 2 = bridge of nose, 3 = right eye, 4 = left half-nose, 5 = left half-mouth, 6 = right half-nose, 7 = right half-mouth)
RACE - race of stimulus face
GENDER - gender of stimulus face
IA_DWELL_TIME_% - Percentage of trial time spent on the current interest area
IA_DWELL_TIME - Dwell time (i.e., summation of the duration across all fixations in the entire trial) on the current interest area
IA_FIXATION_% Percentage of all fixations in a trial falling in the current interest area
IA_FIXATION_COUNT - Total fixations falling in the interest area
TRIAL_DWELL_TIME - Dwell time (i.e., summation of all fixation durations) for the whole trial
TRIAL_FIXATION_COUNT - Total number of fixations in the trial
FIX - pre-stimulus fixation dot location (relative to upcoming stimulus)
FLIP - whether the original stimulus image was left-right flipped at presentation
IA_TOP - Top side pixel position of the AOI
IA_LEFT - Left side pixel position of the AOI
IA_BOTTOM - Bottom side pixel position of the AOI
IA_RIGHT - Right side pixel position of the AOI







(4) >>>>—————— Numerical coding for conditions in ORE_FixReport.txt and ORE_AOIReport.txt ——————<<<<

The data in ORE_FixReport.txt and ORE_AOIReport.txt are equivalent to that in ORE_FixReport.xls and ORE_AOIReport.xls, respectively, except that the text labels for conditions have been coded as numbers, the data column labels in the first row have been removed, and data are tab-delimited.  This allows for easier loading and analysis in custom-made scripts or in other software.  The conditions are coded as follows:

CAUCASIAN = 1
AFRICAN = 2
CHINESE = 3

MALE = 1
FEMALE = 2

TOP = 1
BOTTOM = 2
RIGHT = 3
LEFT = 4

NONFLIP = 1
FLIP = 2

. = 0







(5) >>>>—————— Data columns and data coding in the ORSubjectNum#.txt files ——————<<<<

Each file is a tab-delimited data file (one for each subject).  No eye-movement measurement are recorded in these files, but they can be used to analyze behavioral performance (e.g. accuracy, d’, reaction time) during the experiment.  To prevent poor quality data from being shared, only those participants not excluded from analysis in the manuscript are included in this dataset.  Following are the variables (columns) contained in these files along with the numerical codes for different conditions: 

column 1) subject number
2) trial number
3) race of face (0 = CAUCASIAN, 1 = AFRICAN, 2 = CHINESE)
4) gender of face (0 = MALE, 1 = FEMALE)
5) is it a face to be recognized at test (0 = no; 1 = yes; whether the face is presented both in the study and test phase)
6) fixation location (0 = upper, 1 = right, 2 = lower, 3 = left; pre-stimulus fixation dot location relative to upcoming stimulus)
7) flip (1 = not flipped, 2 = flip; whether the original image was left-right flipped at stimulus presentation)
8) button response code (0 = no response)
9) correctness of response (0 = incorrect, 1 = correct; relevant for test phase trials only)
10) reaction time (in milliseconds from the stimulus onset)